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United States Patent | 5,165,982 |
Gubitz ,   et al. | November 24, 1992 |
The scratch resistance of plastic surfaces can be improved by providing the surfaces with a novel grain structure.
Inventors: | Gubitz; Franz (Kelkheim, DE); Grolik; Walter (Darmstadt, DE); Kuhnhenne; Eckhard (Wiesbaden, DE); Jaksch; Peter (Russelsheim, DE) |
Assignee: | Hoechst Aktiengesellschaft (DE) |
Appl. No.: | 583792 |
Filed: | September 17, 1990 |
Sep 20, 1989[DE] | 3931299 |
Current U.S. Class: | 428/141; 428/120; 428/156; 428/409; 428/908.8 |
Intern'l Class: | B32B 003/00; D06N 007/04 |
Field of Search: | 428/156,105,141,167,409,120,195,332,338,339,908.8 |
3357772 | Dec., 1967 | Rowland | 428/156. |
4352847 | Oct., 1982 | Okiyama | 428/409. |
4367511 | Jan., 1983 | Crass et al. | 428/156. |
4413109 | Nov., 1983 | Haas | 428/156. |
4546029 | Oct., 1985 | Cancio et al. | 428/156. |
______________________________________ Grain accord- Grain according ing to prior to the present art invention ______________________________________ average roughness depth 66.7 .mu.m 50.4 .mu.m maximum roughness depth 77.6 .mu.m 61.8 .mu.m pointed scratching tool pronounced slight flattening load 500 g flattening or or crushing of crushing of grain structure grain structure round scratching tool smoothing and hardly noticeable (r = 0.5 mm) polishing of smoothing and load 600 g grain hill polishing of surface grain hill surface ______________________________________